Detective Constable Al Quinn is in trouble. Callum has told Finn that Al is a corrupt cop. Al manages to convince Finn that Callum is mistaken, but things go from bad to worse when Jake McGrade assaults a security guard and steals a million pounds worth of whiskey from the Port Devine distillery.

Finn is away receiving treatment for his PTSD, so Concepta takes his place on a fishing trip with Shay and Barry. Their pleasure cruise goes horribly wrong, however, when the boat's engine explodes – and crew member Brendan is seriously injured.

Still reeling from the state she found her dad in last night, Niamh suggests he might be suffering from post-traumatic stress disorder following his car crash. A furious Finn flies off the handle – Niamh doesn't know what she's talking about.

Marlene is faced with a problem when some prize-winning racing pigeons are stolen – she's allergic to birds. As a result, Al and Callum investigate the theft. They soon discover that the owner, Hugh McCoy, has been diagnosed with ‘Pigeon Lung' – a rare condition that could kill him. His long-suffering wife Susan reckons that the person who stole the birds has done Hugh a favour.

Sparks fly when Marlene meets an outspoken farmer who hates the police. Meanwhile, a stressed-out Finn is pushed to breaking point.

As the police officers fight to secure a grieving daughter's birthright, Al does something truly terrible to save his daughter's skin.

When a car is pulled from Port Devine harbour, the whole town searches for a missing mother. Meanwhile, Al kisses someone he shouldn't.

When an ATM machine is stolen, new detective Al crosses a line to save someone he loves. Meanwhile, Finn struggles to cope – and has a difficult conversation with Siobhan.

Inspector Finn and new detective Al attend the scene of a shooting – an event unheard of in sleepy Port Devine. Someone has fired a bullet through retired headmaster Eugene McManners' front door. Meanwhile Marlene goes the extra mile for her best friend Nicole, alienating stepdad Barry in the process.

Niamh and Shay are partying on the beach when a hooded figure rugby-tackles a lad to the ground. The figure reveals himself as Niamh and Shay's dad, Inspector Finn O'Hare; he saw the lad trying to sell drugs to the kids. As Marlene sabotages an undercover investigation, Nicole is desperate to be a mum.